CAREER: Fluid Dynamics of Microscopic Defects in Layered Liquids

建议没有。当前位置：cts0547442项目负责人：谢莉·安机构：卡内基梅隆大学职业：层状液体微观缺陷的流体动力学微观缺陷普遍存在于层状液体中，如近晶液晶和浓缩表面活性剂溶液。缺陷在层状液体的流动行为中起主导作用；事实上，流动和缺陷是强耦合的，当试样被剪切时，往往会形成更多的缺陷。因此，缺陷的存在影响了各种各样的工业应用，包括开发利用层状材料有序性质的新应用，如光电器件和显示器，以及封装药物的生物材料的加工，以及涂料、粘合剂、药品和食品的配方和加工。优化这些应用的配方和加工条件的核心问题是，理论和实验都没有充分发展到可以定量描述流动缺陷附近的流体动力学或缺陷与流动的相互作用。这个项目旨在通过开发工具来模拟实验和理论上理想化的缺陷来弥合这一差距。研究计划的中心思想是改变流动装置的长度尺度，以加强对缺陷微结构的控制。预期的结果包括使用几何和表面锚定来调整平衡缺陷阵列结构的能力，开发一个实验相图，组织观察到的缺陷微结构作为初始缺陷配置、流动强度和时间的函数；通过缩放和分析将实验与现有理论模型进行比较；最后，将这项工作扩展到其他层状液体的初步研究。教育计划的中心目标是激励学生学习工程，并通过开发基于组件的学习工具，帮助他们培养对热流体概念的物理直觉，这些工具围绕工程硬件的核心工业相关示例（例如喷墨打印）集成了几个交互式学习活动。这种方法为学生提供了学习基本概念的几个视角，并使他们接触到新兴技术。这些以组件为基础的模块将在各个教育层次和学科中实施，并将简化为K-12的推广活动，旨在鼓励代表性不足的群体参与工程和科学。由电子病历学习和教育研究项目共同资助。

PROPOSAL NO.: CTS-0547432PRINCIPAL INVESTIGATORS: SHELLEY ANNAINSTITUTION: CARNEGIE MELLON UNIVERSITY CAREER: FLUID DYNAMICS OF MICROSCOPIC DEFECTS IN LAYERED LIQUIDS Microscopic defects are ubiquitous in layered liquids such as smectic liquid crystals and concentrated surfactant solutions. Defects play a leading role in determining the flow behavior of layered liquids; indeed flows and defects are strongly coupled and more defects often form when a sample is sheared. The presence of defects therefore impacts a wide variety of industrial applications including the development of novel applications exploiting the ordered nature of lamellar materials, such as optoelectronic devices and displays, as well as processing of biomaterials to encapsulate drugs, and formulation and processing of coatings, adhesives, pharmaceuticals, and food products. The central problem in optimizing formulation and processing conditions for these applications is that neither theory nor experiment are adequately developed to quantitatively describe the fluid dynamics near flowing defects or the interaction of defects with flows. This project aims to bridge this gap by developing tools to model idealized defects both experimentally and theoretically. The central idea of the research plan is to change the length scale of flow devices in order to enhance control over the defect microstructures. The expected outcomes include the ability to tune the equilibrium defect array structure using geometry and surface anchoring, the development of an experimental phase diagram organizing observed defect microstructures as a function of initial defect configuration, flow strength, and time; comparison of experiments with available theoretical models through scaling and analytics; and finally, a preliminary study extending this work to other layered liquids. The central aim of the education plan is to motivate students to study engineering and help them to develop physical intuition for thermal-fluids concepts through the development of component-based learning instruments, which integrate several interactive learning activities around a central, industrially-relevant example of engineering hardware, e.g. inkjet printing. This approach offers students several perspectives from which to learn fundamental concepts, and it exposes them to emerging technologies. The component-based modules will be implemented across education levels and disciplines, and they will be simplified for K-12 outreach activities targeted toward encouraging participation of underrepresented groups in engineering and science.Co-funded by the EHR Research on Learning and Education Program.